svn merge -c 1461597 Merging from trunk to branch-2 to fix HDFS-4581.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461602 13f79535-47bb-0310-9956-ffa450edef68
YARN-474. Revert since compilations fails: svn merge --change -1461403 .

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461626 13f79535-47bb-0310-9956-ffa450edef68
YARN-496. Fair scheduler configs are refreshed inconsistently in reinitialize. Contributed by Sandy Ryza

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461667 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
svn merge --ignore-ancestry -c 1342501 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461718 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-8415. Add getDouble() and setDouble() in org.apache.hadoop.conf.Configuration (Jan van der Lugt via harsh)
Previous commit merges HADOOP-8415 into branch-2.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461722 13f79535-47bb-0310-9956-ffa450edef68
YARN-474. Fix CapacityScheduler to trigger application-activation when am-resource-percent configuration is refreshed. Contributed by Zhijie Shen.
svn merge --ignore-ancestry -c 1461402 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461729 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4621. Additional logging to help diagnose slow QJM syncs. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461779 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4618. Default transaction interval for checkpoints is too low. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461784 13f79535-47bb-0310-9956-ffa450edef68
YARN-209. Fix CapacityScheduler to trigger application-activation when the cluster capacity changes. Contributed by Zhijie Shen.
svn merge --ignore-ancestry -c 1461773 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461790 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9358. "Auth failed" log should include exception string. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461794 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-YARN-474-branch-2-gd